Reference Guide

Chapter 4 SCSI Commands
RELEASE UNIT Command (17h)
DLT-S4 Interface Reference Guide 280
RELEASE UNIT Command (17h) 4
The RELEASE UNIT command releases the tape drive if it is currently
reserved by the requesting initiator. It is not an error to release the drive if
it is not currently reserved by the requesting initiator. If the drive is
reserved by another initiator, however, it is not released; the drive is only
released from the initiator that issued the
RELEASE UNIT command.
Figure 141 RELEASE UNIT
Command Descriptor Block —
Data Format
Note: This command has been made obsolete in the latest version of
SCSI-3 and should not be used with any new implementations.
The tape drive supports this command for legacy applications
only.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (17h)
1 Logical Unit Number 3rdPty Third Party Device ID Reserved
2 — 4 Reserved
5 Control